[Bug c/84739] [6/7/8 Regression] ICE in get_value_for_expr, at tree-ssa-ccp.c:649

[gscfq@t-online.de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84739

--- Comment #1 from G. Steinmetz <gscfq@t-online.de> ---

Configured with --enable-checking=yes :


$ gcc-8-20180304 -O2 -c z1.c
z1.c:1:13: warning: 'baz' alias between functions of incompatible types
'void(void)' and 'void(int,  int)' [-Wattribute-alias]
 static void baz (void) __attribute__((weakref("bar")));
             ^~~
z1.c:14:1: note: aliased declaration here
 bar (int x, int y)
 ^~~
during GIMPLE pass: tailr
z1.c: In function 'bar':
z1.c:19:1: internal compiler error: in gimple_call_arg, at gimple.h:3179
 }
 ^
0xecae86 gimple_call_arg
        ../../gcc/gimple.h:3179
0xecae86 gimple_call_arg
        ../../gcc/gimple.h:3187
0xecae86 eliminate_tail_call
        ../../gcc/tree-tailcall.c:921
0xecae86 optimize_tail_call
        ../../gcc/tree-tailcall.c:953
0xecae86 tree_optimize_tail_calls_1
        ../../gcc/tree-tailcall.c:1082